RT Journal Article SR Electronic T1 Genetic Engineering 3 JF Journal of Medical Genetics JO J Med Genet FD BMJ Publishing Group Ltd SP 239 OP 239 DO 10.1136/jmg.20.3.239 VO 20 IS 3 A1 Pembrey, Marcus E YR 1983 UL http://jmg.bmj.com/content/20/3/239.abstract AB